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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf8097246ded1aa41bc0cdc872d70df4d8f8b317980ca45edf0e66e5dce3749' 
  AND token = 'w7MxrzGh06ODD2bPGUTEEeTH8MI/Kif6Teu6TJ2UbtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}